Fbank j



(No Model.)

I. J. SPRAGUE.

ELEUTRIG MOTOR.

No. 372.823. Patented Nov. 8, 1887.

n-ue n-toz N. PEYERS. Mn-Lllhol lpiwn VII-WING. n. c.

UNITED STATES FRANK J. SPRAGUE,

ELECTRIC MOTOR.-

PATENT OFFIC OF NEW YORK, 1v. Y.

SPECIFICATION forming part of Letters Patent No. 372,823, dated November 8, 1887.

Application filed April 18, 1887.

To all whom it. may concern.-

Be it known that I, FRANK J. SPRAGUE, of the city of New York, in the county and State of New York, have invented a certain new and useful Improvement in Electric Motors, of which the following is a specification.

My invention relates to the driving of ventilating fans or blowers by electric motors; and my object is to produce a cheap, simple, and efiicient arrangement and construction for this purpose.

My invention consists in the novel devices and combinations of devices employed by me in accomplishing the above-named object, as hereinafter set forth and claimed.

In the accompanying drawings, Figure l is an end view of amotor, fan, andinclosing-case embodying myinvention; and Fig. 2, a section on line 2 2 of Fig. 1, with the shaft, the commutator-cylinder, and the legs of the field-magnet in elevation.

A is an annular iron case,open at both ends, and preferably of sheet-iron, and having heavy rims B B,to which the sheet-iron portion A is secured.

O is the shaft carrying the motorarmature D and the fan E. At the fan end of the shaftit is adjustably supported by means of screwbolts a a, passing through a supporting ring or hub, b b, carried by spokes b b. Bolt a sets into a cap, 0, through both ends of which the shaft passes and turns. Boltoisets against an inner bearing, d, on theshaft. By adjusting these screw-bolts the shaft and the fan are centered in the case. The other end of the shaft isjournaled between hangers e e,of nonmagnetic metal,extending from the pole-pieces f f of the field-magnet of the motor. The hangers have concave bearing-surfaces, and the bushing g has a corresponding concave surface,

as illustrated at h, whereby a ball-and-socket joint is formed at this end of the shaft,so that it adjusts itself in accordance with the adj ustment at the other end. After the shaft is properly adjusted the adjusting-screws a a are secured rigidly by the locking-nuts i. The fan blades E are secured to the shaft in the usual or any suitable manner. The armature D is of the ring form, which is most convenient in this form of apparatus.

F F are the wire-wound cores of the fieldmagnet of the motor, having the pole-pieces f f,between which the armature D revolves.

Serial No. 235.149. (No model.)

The cores are bolted each to one of the iron brackets G G,which extend across the rim B of the case, each having an extension, H, at its middle part to which the cores are secured. Both cores being thus attached to the case,said

case forms the yoke or back piece of the magnet. This provides a very simple and at the same time effective construction, the necessity of providing a special back piece for the magnet being done away with.

The whole arrangement is a very simple and economical one, all unnecessary parts being done away with, the motor and fan both being in the same case and on the same shaft, and the case itself providing supports for the shaft.

The commutator-brushes and the electrical connections of the motor are not shown in the drawings. They may be of any eificient character.

What I claim is+ 1. The combination of an iron inclosingcase, an electric motor and a fan in said case, the field-magnet cores of the motor being attached to said case, whereby said case forms the yoke or back piece of said magnet, substantially as set forth.

2. The combination of an annular iron in- -closing-case, a shaft extending from end to end of said case, a fan and an electric-motor armature on said shaft, and field-magnet cores eX- tending in opposite directions from the armature and attached to the case, substantially as set forth.

3. The combination of an iron inclosingand brackets extending across said case, to which the cores of the field-magnet of the motor are respectively connected, substantially as set forth.

4. The combination of an inclosing-case, an electric motor and a fan in said case on the same shaft, said shaft having bearings at one end provided with means for laterally adjusting the shaft, and ball-and-socket bearings at the other end, substantially as set forth.

This specification signed and witnessed this 15th day of April, 1887.

FRANK J. SPRAGUE.

Witnesses A. W. KIDDLE, WM. PELZER.

case, an electric motor and a fan in said case, 

